RX4756 868.35 MHz • • • • • ASH Receiver Ideal for 868.35 MHz, 3 V data Receivers in Europe High-Sensitivity Passive Design with No RF Oscillation Use with HX4007 for 19.2 kbps Data Rate Simple to Apply with External Parts Count Rugged, Surface-Mount Package with 130 mm2 Footprint This amplifier-sequenced hybrid (ASH) receiver is based on several leading-edge SM-10 Case technologies that allow outstanding performance in a small and simple-to-apply module. Two surface-accoustic-wave (SAW) devices are employed. Front-end filtering by a low-loss coupled-resonator SAW filter provides excellent selectivity. Typical sensitivity better than -80 dBm is achieved with no RF oscillating or regenerative circuits. This results in virtually no RF spurious emissions. A low-loss SAW delay line provides the time delay necessary to sequence the two RF amplifiers. Time sequencing of the RF gain eliminates the need for frequency conversion prior to AM detection. This receiver is designed to operate from 3 V lithium battery with typically 2.5 mA current. For system design flexibility, the baseband output is accessible, and the comparator threshold can be changed externally between two settings. Typical applications include unlicensed wireless remote-controls and digital data links operating in Europe under the European Telecommunication Standard (ETSI) 300-220-1. Electrical Characteristics Characteristic Operating Radio Frequency Sym Notes fC 2,3 868.35 Nominal 4,5 Pulse Modulation (OOK) Received Carrier Modulation Type RF Band Minimum Sensitivity Typical -10 6 Channel Width Half-Frequency Spurious Sample Duration Sample Repetition Rate Data Rate Default (Terminal 5 LOW) Digital Output Power Supply Output HIGH Voltage VOH Output LOW Voltage VOL 11 kHz 56 kbps 25 10 pF VCC -0.2 VCC V 0.0 0.2 tR 3 Fall Time tF 3 VCC Current at 25C and 3.0 V ICC TA 1 1 2.7 ms 3.0 3.5 VDC 4 5 mA +85 °C -40 RFM RX4756 Lid Symbolization (in addition to Lot and/or Date Codes) Phone: (972) 233-2903 mV 0 Rise Time Operating Voltage ns 625 CMOS Load Capacitance Operating Ambient Temperature RF Monolithics, Inc. 700 10 Override (Terminal 5 LOW) dB 15 9 Comparator Threshold W 80 8 dBm kHz 50 Nominal 7 fC ± 1 MHz Sequencing (Sampling) fC±200 ZIN Input Impedance Units MHz -71 Operating Signal Strength Interference Rejection Maximum Fax: (972) 387-8148 ©1998 by RF Monolithics, Inc. The stylized RFM logo and RFM are registered trademarks of RF Monolithics, Inc E-mail: [email protected] http://www.rfm.com RX4756-121198 Page 1 of 4 The RX Series SMT Hybrid ASH Receivers CAUTION: Electrostatic Sensitive Device. Observe precautions for handling. Notes: 1. Unless noted otherwise, specifications apply over the entire specified operating temperature and voltage ranges. 2. One or more of the following United States patents apply: 4,454,488; 4,616,197; 4,749,964; 4,902,925. Other patents are pending. 3. Typically, equipment utilizing this device requires emissions testing and government approval, which is the responsibility of the equipment manufacturer. 4. The design, manufacturing process, and specifications of this device are subject to change without notice. 5. A variety of on-off-keyed (OOK) pulse modulation schemes are possible since digital decoding is an external function (not included in the ASH receiver). 6. These parameters apply over the absolute minimum operating passband which is referenced to fC. 7. With interfering signal matched to the receiver modulation and code. See “Typical Modulated Interference Rejection” for a more detailed view. 8. Sample repetition rates greater than 1 MHz are available in custom versions. Contact RFM for details. 9. Baseband data rates are available to 20 kbps, respectively, in custom versions. Contact RFM for details. See HX/RX Designer’s Guide for details on data rate limits. 10. The default comparator threshold (with terminal 5 not connected) is optimized for low duty-cycle, or “bursty” data and eliminates noise output when there is no RF signal. The override threshold (with terminal 5 connected to ground) is optimized for continuous data. 11. The ASH receiver is designed to drive a single CMOS load. 12. For ESD protection Absolute Maximum Ratings Rating Value Units +10 dBm -0.3 to +4.0 VDC Incident RF Power Power Supply Voltage (VCC to Ground) (Observe ESD Precautions) ESD (100 pF, 1.5 kΩ) Terminals 2, 3, or 7 to Ground ±2000 All Other Terminals to Ground ±300 -40 to +100 Case Temperature V °C Block Diagram and Electrical Connections 50 ohm Antenna Note 12 10 9 8 7 RF Input Gnd Gnd Data Output 6 Voltage Reference 1 uF Top View Pulse Generator RF Amp. SAW Delay Line RF Amp. AM Detector LPF SAW BPF Comparator Baseband Output 2 Vcc 1 +3V Comparator Input 3 Gnd 4 Threshold Override 5 10 uF 0.1 to 10 uF RF Monolithics, Inc. Phone: (972) 233-2903 Fax: (972) 387-8148 ©1998 by RF Monolithics, Inc. The stylized RFM logo and RFM are registered trademarks of RF Monolithics, Inc. E-mail: [email protected] http://www.rfm.com RX4756-121198 Page 2 of 4 The RX Series SMT Hybrid ASH Receivers Demonstration Circuit 1 16 2 15 14 Top View 1 Vcc +3V Lithium CR2032 RF In 10 10 uF Gnd 9 3 3 Comp In Gnd 8 4 Data Out 7 5 Vref 6 6 11 7 10 4 Gnd 5 Thres Override 1 uF MC145028 Decoder 10 uF 2 BB Out 13 1 mA @ 3 VDC RS 273-065A or equiv 12 Piezo Alarm 33 K 0.1 uF 0.1 uF OPEN: Default 25mV CLOSED: Override 0V 8 620 K 9 Typical Modulated Interference Rejection (433.92 MHz RX1000 Shown) This plot is for an interfacing signal modulated with the receiver’s modulation and code. Continuous wave (CW) or signals with other modulation or codes typically result in significantly better rejection performance. Spurious Rejection Relative to Passband Sensitivity (dB) 0 0 10 10 20 20 30 30 40 40 50 50 60 60 70 70 80 80 90 90 100 100 110 110 120 140 160 180 200 220 240 260 280 300 320 340 360 380 400 420 440 460 480 500 520 540 560 580 600 620 640 216.96 Half Freq. Spurious Response RF Monolithics, Inc. Phone: (972) 233-2903 433.92 Operating Freq. Fax: (972) 387-8148 ©1998 by RF Monolithics, Inc. The stylized RFM logo and RFM are registered trademarks of RF Monolithics, Inc. Frequency (MHz) E-mail: [email protected] http://www.rfm.com RX4756-121198 Page 3 of 4 The RX Series SMT Hybrid ASH Receivers Case Design 0.370 (9.40) 0.241 (6.12) 0.10 (2.54) 0.050 (1.27) 10 Places 0.070 (1.78) 4 Places RFM Rxxxxx 0.540 (13.72) 0.065 (1.65) 10 Places 0.100 (2.54) 4 Places Typical Antennas A B C D Ground Plane 50 Ω Enameled Wire, AWG = G Inner Dia = E No. Turns = F Frequency Dimensions Units 303.825 A B C 418.0 433.92 916.5 Inches 5.35 3.9 3.55 1.58 Millimeters 135.89 99.06 90.17 40.13 Inches 1.0 0.6 0.6 0.4 Millimeters 25.4 15.24 15.24 10.16 Inches 0.25 0.6 0.55 0.18 Millimeters 6.35 15.24 13.97 4.4 Inches 3.7 2.7 2.4 1.0 Millimeters 93.98 68.58 60.96 25.4 Inches 0.375 0.1 0.1 0.1 Millimeters 9.53 2.54 2.54 2.54 F Number of Turns 4T 16T 15T 7T G AWG #20 #22 #22 #24 D E RF Monolithics, Inc. Phone: (972) 233-2903 Fax: (972) 387-8148 ©1998 by RF Monolithics, Inc. The stylized RFM logo and RFM are registered trademarks of RF Monolithics, Inc. E-mail: [email protected] http://www.rfm.com RX4756-121198 Page 4 of 4